Submarine geo-hazards on the eastern Sardinia-Corsica continental margin based on preliminary pipeline route investigation

Marine Geophysical Researches, An International Journal for the Study of the Earth Beneath the Sea Published online: 8 April 2011, Springer Science+Business Media B.V. 2011

08 Apr 2011
S. Cecchini, D. Taliana, L. Giacomini, C. Herisson, B. Bonnemaire
DOI: DOI 10.1007/s11001-011-9126-0

Abstract
The understanding of the morphology and the shallow geo-hazards of the seafloor is a major focus for both academic and private industry research. On November and December 2009 a geophysical pipeline survey was carried out by Fugro Oceansismica S.p.A. (FOSPA) and FUGRO France(FFSA)forDORISEngineeringonbehalfofGRTgaz (Engineering centre, Transmission Pipe Department; www.grtgaz.com) which are currently investigating the possibility of laying a pipeline betweenSardinia and Corsica as a spur line from the planned GALSI Project. The Project, ‘‘Alimentation de la Corse en gaz naturel’’, consists of a corridor 100 km long and 1.0 km wide along the Corsica-Sardinia shelf. The integration of the multibeam, sidescan sonar and sparker data provided a high resolution seafloor mapping for geo-hazard assessment. In this article the data acquired along a break of slope section (approximately 20 km 9 1.5 km), in the eastern sector of the Strait of Bonifacio are described. The area was abandoned during the survey, because of its unsuitability. Indeed, in this area the continental shelf, approximately 100 m deep and deepening gently eastward, is characterized by an uneven morphology, with different seabed features such as Beach-rocks mainly NNW-SSE oriented. Also, the continuity of the continental margin, identified around -110/-115 m, is interrupted by four canyon heads which incise the slope and are associated with glide deposits.

 

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